linux-kernel - Re: [PATCH 02/17] perf: Add ability to attach user level registers dump to sample

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Message-ID: <20120725170008.GB17355@infradead.org>
Date:	Wed, 25 Jul 2012 14:00:08 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Jiri Olsa <jolsa@...hat.com>, a.p.zijlstra@...llo.nl,
	mingo@...e.hu, paulus@...ba.org, cjashfor@...ux.vnet.ibm.com,
	eranian@...gle.com, gorcunov@...nvz.org, tzanussi@...il.com,
	mhiramat@...hat.com, robert.richter@....com, fche@...hat.com,
	linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com,
	drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org
Subject: Re: [PATCH 02/17] perf: Add ability to attach user level registers
 dump to sample

Em Wed, Jul 25, 2012 at 06:13:06PM +0200, Frederic Weisbecker escreveu:
> On Sun, Jul 22, 2012 at 02:14:25PM +0200, Jiri Olsa wrote:
> > Introducing PERF_SAMPLE_REGS_USER sample type bit to trigger
> > the dump of user level registers on sample. Registers we want
> > to dump are specified by sample_regs_user bitmask.
> > 
> > Only user level registers are dumped at the moment. Meaning the
> > register values of the user space context as it was before the
> > user entered the kernel for whatever reason (syscall, irq,
> > exception, or a PMI happening in userspace).
> > 
> > The layout of the sample_regs_user bitmap is described in
> > asm/perf_regs.h for archs that support register dump.
> > 
> > This is going to be useful to bring Dwarf CFI based stack
> > unwinding on top of samples.
> > 
> > Signed-off-by: Jiri Olsa <jolsa@...hat.com>
> > Original-patch-by: Frederic Weisbecker <fweisbec@...il.com>
> 
> Acked-by: Frederic Weisbecker <fweisbec@...il.com>

Cool, Stephane, Peter, are you ok with it? Can I get your Acked-by or
even Reviewed-by?

- Arnaldo
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